Table 2:
Site of membranous obstruction on the basis of examination of different sequences
| Sequences | Localization of Obstructive Membranes |
Total Number of Membranes | ||||||
|---|---|---|---|---|---|---|---|---|
| Foramen of Monro | Cerebral Aqueducts | Superior Velum Medullary Synechia | Foramen of Magendie | Foramina of Luschka | Foramen Magnum | Cisterns | ||
| Conventional T1 and T2 | 7* | 41 | 1 | 4 | 3 | 0 | 1 | 57 |
| 3D CISS | 7 | 41 | 5 | 28 | 46 | 2 | 28 | 157 |
*
These cases were indirectly diagnosed on the basis of unilateral or bilateral lateral ventricular dilation. There are 2 bilateral membranes in 5 cases.